Since changing the specification (or even thinking that you might have to change the specification) results in the printer being "closed" and "opened", the behavior you do not like is a Windows behavior and beyond our control.
Sorry.
As Support mentioned, we expect to add "combine" functionality to the next release of ePrint.
If someone wants to see all the outstanding PO's, and you not just print the PO report and show them the list?
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Andrew Bates